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kolezko [41]
3 years ago
5

Name the five cardiac cycle activities starting with excitation and ending with regulation of blood flow and volume.

Biology
1 answer:
stira [4]3 years ago
3 0

Answer:

Explanation:

1) Excitation brings about contraction.

2) Contraction leads to an increase in blood pressure.

3) Changes in blood pressure results in the opening and closing of the heart valves.

4) The opening and closing of heart valves then regulates the flow of blood and it's volume.

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In men, the primary source of androgens is the ____, while the ____ is/are where the remaining androgens are produced.
Tema [17]

The primary source of androgens is the Testes.

The Adrenal gland  is/are where the remaining androgens are produced.

<h3>The Adrenal Gland </h3>
  • The Adrenal glands  produces the androgens
  • The Androgens are  hormones that regulates the development and maintenance of male reproductive characteristics.
  • The main source of the androgens is the testes.

Learn more on Adrenal glands here :brainly.com/question/23487477

6 0
2 years ago
Carbohydrates are an important type of
Pachacha [2.7K]
Carbohydrates are an important type of FOOD MACRO MOLECULES.
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Carbohydrate is an important source of fuel for the biological system. 
7 0
4 years ago
Plant spores are usually
max2010maxim [7]

Answer:

The correct answer will be option- A

Explanation:

Spores are the reproductive unit produced as a result of sexual reproduction and asexual reproduction in both lower and higher plants.

The plant groups like Fungi, Algae, Bryophytes, Pteridophytes and Gymnosperms produce these spores which provides adaptation as they can be dispersed for the long-distance as well as germinate and form an organism.

The spores are formed by the process of sporogenesis which forms four spores from a diploid structure their meiosis which reduces the genetic material to half and maintain the haploid ploidy number.

Thus, option-A is the correct answer.

4 0
3 years ago
Ocean floors are well mapped. <br><br> True <br> False
Kamila [148]
Maybe its I think it's false
6 0
3 years ago
Read 2 more answers
What is the relationship between undisturbed sedimentary rock layers and fossils?
Juli2301 [7.4K]

Answer:

Older fossils are found in deeper layers of sedimentary rock.

Explanation:

The relationship between undisturbed sedimentary rock layers and fossils is that older fossils are found in deeper layers of sedimentary rocks.

This is one of the premise of the law of superposition and principle of fossil and fauna succession.

  • An undisturbed sequence is one in which the sedimentary layers have been arranged sequentially.
  • The oldest is at the bottom and the youngest on top.
  • Also, fossils grade in this manner too.
  • The oldest fossils will be in the oldest bed which is the deepest layer.
  • The youngest bed will contain the youngest fossils in like manner too.
7 0
3 years ago
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